Can you please balance these for me please
Zn+O2+ZNO2
Copper(group 2)+hydrochloric acid=Copper(2)chloride +oxide

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Originally Posted by Jeremywhitts

Can you please balance these for me please
Zn+O2+ZNO2
Copper(group 2)+hydrochloric acid=Copper(2)chloride +oxide

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2Zn + O2 -> 2ZnO
Zinc oxidizes to +2 state, oxygen reduces to -2, so two Zn are required for two O

Cu + 2HCL -> CuCl2 + H2

Cu oxidizes to +2 state, and 1 e- is required to reduce a hydrogen atom, so one Cu will reduce two H, which forms diatomic H2 gas